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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f47490e68e5eb8a19046a3abace6bc881a13a896bdd8c714c0be4fb8a3998a' 
  AND token = '+aAqK9h3fW8ICQw+e4cXYaGe5ni7YVAnD1YIVGQKl1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}